Reactance-coil.



T. EMUERAY & P. TORCHIO.

REAGTANGE COIL.

APPLICATION FILED MAY 19, 1911.

Patented Feb. 13, 1912.

INVENTORJ 11 TE STATES EEACTANCE-COIL.

ori-ere.

Specification of Letters Patent.

To aZZ whom it may concern Be it known that we, THOMAS E. MUR-' RAY, acitizen of the United States, and PHILIP ToRoHIo, a subject of the Kingof Italy, residing at New York, in the county of New York and State ofNew York, have invented a certain new and useful Improvement inReactance-Coils, of which the following is a specification.

The invention is an improvement in flat spiral react-ance coils for hightension voltage. Such coils are commonly used in se rice with high speedalternating current generators to limit the instantaneous inrush ofcurrent under short circuit conditions. This relieves the generatorwinding from abnormal. stresses and facilitates the parallel operationof other generators and synchronous apparatus in the system.

The invention consists, first, in the construction of the reactance coilwhich may be formed of a plurality of units, each unit being a flatspiralpf wire having its turns disposed in a plane passing through thelongitudinal axis of the wire; second, in the combination of such coilwith a casing of insulating refractory material; and third, in thesectional construction of said casing, as hereinafter more particularlyset forth.

In the accompanying drawings Figure 1' is an elevation of the casing anda coil of flat parallel spirals therein. Fig. 2 is a vertical section onthe line 00, so of Fig. 3. Fig. 3 is a top view,with the cover plateremoved. Fig. 4; shows the standard and bottom plate, Fig. 5, one of therecessed radial arms or supports, Fig. 6, a top view of one of the Wallsections, and Fig. 7, a bottom view of same; Figs. 4, 5, 6 and 7 beingin perspective.

Similar numbers of reference indicate like parts.

The casing is cylindrical in form, and is to be made of insulatingrefractory material, such as porcelain. The bottom plate 1 is formedwith air openings 2, preferably produced by molding said plate with acentral tubular portion 3, and partitions tradiating therefrom to therim. The central tubular standard 5 is seated upon the portion 3 of thebottom plate, or, if desired, may be formed integral therewith. In theouter periphery of said standard are equidlstantly spaced radiatinggrooves 6. The body portion of the casing is built up of similar arms 7,Fig. 6. Each arm is suitably formed at its inner end 8 to fit in thegrooves 6, and at its outer end is provided with a shoulder 9. In theupper side of each arm are formed recesses 10. The wall is built up ofsimilar arc-shaped sections 11, Figs. 6 and 7, in which are notches 12to receive the shouldered outer ends 9' of arms 7 Through said sectionsare made openings 13 toreceive the brass bolts 14. On the underside ofeach section the openings are countersunk, as shown at 15, and on,theupper side are circular projections 16 surrounding each opening. Thecover plate 17 is provided with a central opening 18.

Patented Feb..13,1912.

Application filed May 19, 1911. Serial No. (528,268.

The casing is assembled and the spirals are disposed therein in thefollowing manner. The'standard 5, if made separate from.

the bottom plate 1, is placed uponthe central portion of said plate, sothat the grooves 6 come directly over the radial partitions 4-. Uponeach partition is laid a recessed supporting arm 7, the inner ends 8 ofsaid arms being inserted in the grooves '6' of said stand.- ard, andupon the up side of the rim of the bottom plate, a su ilcient number ofwall sections 11 are laid. to complete the circle; the shoulderednotches 12 in said sections then receiving the shouldered outer ends 9of the arms. The wire 19, which forms the coil, is carried upwardthrough one of the openings 2 of the bottom plate, and is then laid-as aflat spiral, as shown at 20, Fig. 3, in the recesses 10, until saidrecesses are filled. A. second 'series of arms 7 is then placed upon thefirst series, and a second series of wall sections is placed upon thefirst Series of wall sections, the projections 16 on the lower series ofsections entering the countersinks15 in the upper series, and the endsof the arms being received, as before, in the grooves and recesses.' Asecond flat spiral 21 of wire is laid from out in in the recesses of thearms just placed in "position. More arms and wall sections are thenadded in the same way, and the Wire of the'fiat spirals is embeddedbetween said arms, un-- secured by nuts entering counter-sinks in saidplates: see Fig. 1.

The coil formed of a series of superposed fiat or pan cake spirals is anespecially advantageous construction, since for equal factor of safetyin design, it gives for thesame number of turns greater reactance than ahelical or concentric winding, besides allowing interchangeability anduniformity of design for different sizes and values of coils. Theconstruction of the casing in sections permits of any desired number offlat spirals being employed to form the coil, and by varying the numberof recesses in the arms, the number of turns in each spiral may beincreased or diminished.

In practice, we have found it desirable to make the cover and bottomplates and standard of soapstone, and the arms andwall sections ofporcelain. Insulating refractory material offers many advantages, suchas safety to life and protection against damage by magnetic bodies beingdrawn into the coil by its strong field: fireproof qualities at veryhigh temperature: high heat radiating capacity: great dielectricstrength: and being non-hygroscopic, it preserves its insulatingqualities under all conditions. The glazed surface of porcelain and thelike prevents the deposit of'dust, and so keeps the insulation betweenthe windings of the wirewhich may be bare-free therefrom.

The casing is preferably to be placed so that.

a cooling air current may be directed through the openings in the coverand bottom plates, and between the supporting arms.

.We claim 1. An electric coil of flat parallel spirals, a centralstandard, a plurality of superposed supports thereon having recesses forembedding the wire of said spirals, and a wall surrounding anddetachably secured to said supports.

2. An electric coil of fiat parallel spirals, a central standard, aplurality of superposed supports thereon having recesses for embeddingthe wire of said spirals, and a wall formed in detachably connectedsections surroundingand detachably secured to said supports.

3. An electric coil of flat parallelspirals, a central standard, aplurality of superposed ,supports thereon provided with registeringopenings, each support having recesses for embedding the wire of aspiral, and a wall surrounding and detachably secured to said supports.

4. An electric coil of fiat parallel spirals and a casing thereforcomprising inner and outer concentric tubular walls, and partitions inthe space between said walls and separating said spirals: the said wallsand partitions being of insulating refractory material.

5. An. electric coil of flat parallel spirals and a casing thereforcomprising inner and outer concentric tubular walls, and partitions inthe space between said walls and separating said spirals: the said wallsand partitions being of insulating refractory material, and the saidouter wall and partitions being formed in detachable sections.

6. An electric coil of fiat parallel spirals, a central standard, aninclosing wall, and partitions for separating said spirals: the saidpartitions, standard and wall being formed of insulating refractorymaterial.

7. An electric coil of flat parallel spirals, a central standard, aninclosing wall, and

1 partitions for separating said spirals: the

said partitions, standard and wall being formed of insulating refractorymaterial and detachably secured together.

8. An electric coil of flat parallel spirals, a central standard, aninclosing wall, and-partitions for separating said spirals: the'saidpartitions, standard and wall being formed of insulating refractorymaterial and detachably secured together, and each of said partitionshaving recesses for embedding the wire of one of said spirals.

9. A flat spiral electric coil, a central standard, .and arms radiatingtherefrom, each arm having a plurality of recesses in one edge forreceiving the wire of said coil.

10. An electric coil of flat parallel spirals,

a central standard, a series of arms radiating therefrom, each armhaving a plurality of recesses in one edge for receiving the wire of oneof said spirals, and a second series of similar radiating recessed armsregistering with said first series and closing the recesses therein. a

11. A flat spiral electric coil, a central.

standard having longitudinal grooves in its periphery, and radial armsentering said grooves and having recesses in one edge for.

embedding the wire of said coil.

12. A flat spiral electric coil, 2. central standard having longitudinalgrooves in its periphery, radial arms entering said grooves and havingrecesses in one edge for embedding the wire of said spiral, and a rimsecured to said arms.

13. An electric coil of flat parallel spirals,

a central standard, a plurality of seriesof superposed radiating armsdetachably se cured thereto, each arm having recesses in ene edgeembedding the wire of a spiral, the arms of one series closing therecesses of the next adjacent series, rims formed in areshaped sectionsdetachably secured to the ends of said arms, a base plate, and means fordetachably securing said rims together and to said base plate.

14. An electric coil of flat parallel spirals, a central standard, aplurality of series of superposed radiating arms detachably securedthereto, each arm having recesses in one edge embedding thewire of aspiral, the arms of one series closing the recesses of owers the nextadjacent series, rims formed in areshaped sections detachably secured tothe ends of said arms, a base plate, a cover plate, and means fordetachably securing said rims together and to said base plate and saidcover plate.

15. A flat spiral electric coil, a central standard having longitudinalgrooves in its periphery, radial arms having recesses in their edges-forreceiving the wire of said a coil, and a rim having internal groovesparallel to the grooves in said standard, the said arms being receivedat their ends in the grooves in said standard and rim.

16. A flat spiral electric coil, a central standard having longitudinalgrooves in its periphery, radial arms having recesses in their edges forreceiving the Wire of said coil, and a rim formed of arc-shaped.sections having internal grooves parallel to the o'oves in saidstandard; the said arms be- 1n received at their ends in the grooves in'said standard and rim.

17. An electric coil of flat parallel spirals,

a central standard, a series of arms detachably secured theretoradiating therefrom and having recesses in one edge, a second series ofsimilar detachable notched radiat- THOMAS E. MURRAY.

PHILIP TORGHIO.

Witnesses:

GERTRUDE T. PORTER, -MAY T. MCGABRY.

